Washington Solar Incentives 2026: What's Available Now

The Federal ITC Expired — What Washington Offers Instead

The 30% federal residential solar tax credit expired on December 31, 2025, and will not be renewed. Washington homeowners installing solar in 2026 get zero federal support. No extension, no successor program, no residential federal credit of any kind. Plan without it.

Washington's state-level toolkit is narrower than Oregon's but not empty. The state offers a sales and use tax exemption on solar equipment, mandatory 1-to-1 net metering through all utilities, and a small suite of low-income and community programs via the Washington State Housing Finance Commission (WSHFC). Because Washington has no state income tax, there is no state tax credit — the incentive structure is entirely rebate- and exemption-based.

Washington State Tax Credits & Rebates

Washington does not impose a state personal income tax, so there is no state solar tax credit. There is also no active statewide cash rebate for residential solar as of 2026. The previous Renewable Energy System Incentive Program (RESIP), which paid production incentives for in-state-manufactured systems, fully expired and was not reauthorized. The legislature has discussed a replacement in recent sessions but nothing has become law.

What is active: the sales and use tax exemption on solar equipment (covered in its own section below), net metering, property tax exemption, and targeted low-income programs through WSHFC. For middle-income residential buyers going solar in Washington in 2026, the sales tax exemption is the single largest state-level benefit — worth several hundred to over a thousand dollars depending on system size.

Property Tax Exemption for Solar

Washington law exempts residential solar PV systems up to 10 kW from added property tax assessment under RCW 82.16.110. The exemption means that installing solar on your home does not trigger a reassessment or increase your property tax bill.

Systems larger than 10 kW may still qualify for partial exemption or full exemption on the first 10 kW, depending on the county assessor's interpretation. Most residential systems fall under 10 kW, so this rarely becomes an issue. If you install 12-15 kW or larger, ask your installer to provide documentation you can share with the county to clarify exemption status.

Sales Tax Exemption for Solar Equipment

At an average combined state and local sales tax rate of around 9.5%, the exemption saves about $950-$1,400 on a typical $10,000-$15,000 hardware package. This is one of the most valuable exemptions in the country. Make sure your installer applies it on the invoice — some installers incorrectly charge sales tax and then process refunds, which creates cash-flow headaches.

Commercial and community-scale systems up to 100 kW AC are also covered. Batteries paired with solar are included in the exemption when installed as part of the same project. Retrofit battery-only installs not tied to a solar project may not qualify; check with your installer.

Net Metering Policy in Washington

Washington state law requires all utilities (investor-owned, PUDs, municipal, cooperative) to offer net metering at a 1-to-1 retail rate credit until the utility's aggregate net-metered capacity reaches 4% of its 1996 peak load. After the cap is hit, utilities may shift to a successor tariff, which most have not done yet — capacity headroom remains in most territories as of 2026.

Puget Sound Energy, Seattle City Light, Tacoma Public Utilities, Snohomish PUD, Avista, and Pacific Power all currently offer 1-to-1 net metering to residential solar customers. None have hit the 4% cap. Rural co-ops (Inland Power & Light, Big Bend Electric, Okanogan County Electric) offer the same, with caps tracked individually.

Once the 4% cap is reached, the utility must file a successor tariff with the Washington Utilities and Transportation Commission (WUTC). The direction of successor tariffs elsewhere in the West (California's NEM 3.0) suggests future Washington customers may see reduced export rates. Locking in your interconnection date under current 1-to-1 terms — while the cap still has room — is a meaningful consideration for 2026 buyers.

Utility-Specific Rebates

Utility-funded residential solar rebates are largely paused in Washington for 2026. Seattle City Light, Snohomish PUD, and Puget Sound Energy previously ran production incentive or installation rebate programs tied to the state RESIP; all ended when RESIP expired.

What remains: Tacoma Public Utilities offers a small per-system rebate through its solar program, updated periodically. Chelan County PUD funds a production-based incentive that pays a few cents per kWh for systems installed in Chelan County. Snohomish PUD runs a community solar subscription program in lieu of a direct rebate. Always check your utility's conservation or renewable-energy page before assuming a rebate is available.

For battery storage, no utility in Washington currently offers a dedicated battery rebate for residential customers. This is a gap compared to California's SGIP or Oregon's ODOE storage rebate. Batteries remain useful for backup and resilience but are paid for entirely out of pocket.

Low-Income Solar Programs

The Washington State Housing Finance Commission (WSHFC) administers the Sustainable Energy Trust (SET) and related funds, which periodically finance solar installations on affordable housing and for low-income homeowners. Eligibility tracks AMI thresholds, and applications go through partner nonprofits rather than directly to WSHFC.

Community Solar for the Public, administered by Washington State University Energy Program and WSHFC, is an equity-focused program delivering solar on public buildings with bill-credit carve-outs for low-income participants. This is primarily institutional, but low-income residents can benefit via subscription to program-affiliated community projects.

Seattle Light's Low-Income Weatherization program includes solar in a small number of whole-home energy retrofits each year. Seattle Office of Housing partners on this. Applications typically go through community action agencies like Byrd Barr Place or El Centro de la Raza.

Solar for Renters & Community Solar

Washington's community solar framework exists but is small. Utility-sponsored community solar projects operated by Seattle City Light, Snohomish PUD, and Puget Sound Energy sell "panel units" or subscriptions to residential customers. Returns vary: some projects pay bill credits over 20-25 years that roughly equal the upfront subscription cost; others are positive-NPV but only marginally.

Third-party community solar — the model common in Oregon, Colorado, and New York — is not fully authorized in Washington. Without that framework, renters and shaded-roof homeowners have fewer community solar options. A handful of co-op-operated projects exist in rural counties (e.g., Inland Power).

Renters in apartment buildings have limited rooftop solar options. Balcony-scale and portable generator-battery systems remain the pragmatic path for renters who want some measure of solar production until landlords are willing to install rooftop systems or until the state authorizes a broader third-party community solar market.

Sizing for Washington's Climate

Western Washington (Seattle, Tacoma, Olympia) is cloudy. Seattle averages 3.6 peak sun hours per day annualized; a 7 kW south-facing system produces about 8,200 kWh per year. Eastern Washington is much sunnier — Spokane sees 4.5 peak sun hours, Yakima about 5.0. East-side production for the same 7 kW array runs 10,100-11,400 kWh annually.

Winter production in western Washington is low enough that December generation often covers only 25-30% of a typical household's winter consumption. Net metering credits built up in summer carry you through; this is why the 1-to-1 annual rollover is essential and why oversizing wastes money — any credit remaining at March 31 true-up is given to low-income assistance and does not return to you.

Expected Monthly Production in Washington

Note the roughly 35% production gap between Seattle and Spokane for the same hardware. If you live east of the Cascades, your economics are meaningfully better than the statewide average. This is rarely highlighted in statewide solar marketing, but it substantially changes whether solar pencils out.

Washington vs. Neighboring States

Washington's incentive structure is the leanest of the three West Coast states. No state cash rebate, no state tax credit. The sales tax exemption is valuable but it offsets less than Oregon's ODOE rebate + Energy Trust stack. California's higher retail rates compensate for its weaker rebate structure. Washington sits in the middle: decent exemptions, mandatory 1-to-1 net metering, but low retail rates that reduce the dollar value of each offset kWh.

The honest assessment for 2026: solar in western Washington is now a weaker financial investment than in most other western states, given the loss of the federal ITC. Eastern Washington is closer to neutral or slightly positive. Homeowners prioritizing resilience, future rate-increase protection, or environmental values can still justify solar; homeowners prioritizing pure ROI should run numbers carefully and consider whether their capital earns more elsewhere.

Bottom Line: Should You Go Solar in Washington in 2026?

Washington in 2026 is a marginal-ROI market for purchased residential solar. The loss of the federal ITC hits Washington harder than most states because there is no state rebate or tax credit to partially fill the gap. The sales tax exemption is valuable but not transformative. Payback periods typically run 15-19 years for western Washington and 13-16 years for eastern Washington.

Solar still makes sense in Washington if: you live east of the Cascades; your primary motivation is resilience (pair with battery, accept the economics); you expect meaningful electricity rate increases over the next decade; or you are committed to living in the home long-term and want to lock in a known energy cost. Solar makes less financial sense if: you live in western Washington and are motivated primarily by ROI; your current electric bill is under $80/month (very low usage makes payback worse); or you expect to sell within 5-7 years. Prioritize getting the sales tax exemption applied correctly on your invoice — this is the single most valuable state-level benefit. Verify your installer is a Washington-licensed electrical contractor and your utility has confirmed interconnection availability at your address before signing.

Common Washington Solar Pitfalls to Avoid

Mistake number one in Washington: a contractor charging sales tax on the system and then telling you to file for a refund later. That is not how the exemption works. RCW 82.08.962 is a point-of-sale exemption — the contractor should not collect the tax in the first place. If the quote includes sales tax on hardware, push back or find a different installer familiar with the exemption.

Mistake number two: oversizing a system for winter load. Western Washington winter production is so low that no reasonable system size can offset January-February consumption entirely. Oversizing produces excess summer credits that are forfeited at year-end true-up. Size to 80-95% of annual kWh, leave some usage on the utility bill in winter, and let net metering roll summer credits forward.

Mistake number three: overlooking the 4% net-metering cap. Most utilities still have capacity headroom as of 2026, but once the cap is reached, the utility can move to a successor tariff that may pay less than full retail for exports. If your utility is close to its cap, interconnection timing matters. Check with the utility's customer-side generation office.

Mistake number four: paying for battery backup without understanding Washington's incentive gap. Unlike California (SGIP) or Oregon (ODOE storage rebate), Washington has no battery-specific rebate. Battery backup costs $10,000-$20,000 out of pocket. The resilience value is real, but the financial return on a battery in Washington is essentially zero — buy it for the capability, not for savings.

How to Stack Incentives: 7 kW System Example

Frequently Asked Questions

Does Washington have a state solar tax credit in 2026?

No. Washington has no personal state income tax, so there is no state solar tax credit. Your state-level savings come from the sales and use tax exemption, property tax exemption, and net metering — not from a credit on your return.

Is the federal solar tax credit available in Washington in 2026?

No. The federal residential ITC (Section 25D) expired on December 31, 2025, nationwide. It is not available anywhere in the U.S. for residential systems installed in 2026 or later.

What is Washington's sales tax exemption on solar?

Under RCW 82.08.962 and 82.12.962, residential solar PV systems under 100 kW are exempt from state and local sales and use tax. This covers panels, inverters, racking, and wiring. Current authorization runs through 2029. On a typical residential system, the exemption saves $950-$1,400.

How does net metering work in Washington?

All utilities must offer 1-to-1 retail-rate net metering until aggregate net-metered capacity hits 4% of the utility's 1996 peak load. Most utilities still have headroom. Excess monthly credits roll forward; any remaining credits at the March 31 true-up are donated to low-income assistance.

Is solar worth it in Washington without the federal credit?

The economics are marginal for pure ROI, especially in western Washington with cloudy winters and low retail rates. Payback periods typically run 15-20 years. Buyers should be honest with themselves: if your motivation is backup power, independence, or reducing utility-purchased electricity, solar still makes sense. If your motivation is financial returns alone, Washington ranks below most other western states.

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Learn More About Solar Incentives and Costs

Explore our other comprehensive solar guides to make the most informed decision:

• Solar Incentives by State (2026) — Hub Guide
• Solar Panel Cost by State (2026)
• Solar Tax Credit Guide (2026)
• Is Solar Worth It in 2026?
• Solar Incentives in Oregon
• Solar Incentives in California